Micro jet gas film generation apparatus

Abstract

A micro jet gas film generation apparatus aims to eject a gas to a work object which is desired for cooling or insulating from heat. The micro jet gas film generation apparatus has a spout formed at a diameter of 5-100 μm to generate a gas film on the work object. As the diameter of the spout of the micro jet gas film generation apparatus is small, the micro jet gas film generated from the spout cannot produce a large eddy due to the lack of sufficient energy, hence can maintain a thin film after a long distance ejection to improve cooling and heat insulation performance. Moreover, due to the small diameter of the spout, it also consumes less gas and can reduce the amount of gas required.

Description

FIELD OF THE INVENTION[0001]The present invention relates to a cooling and heat insulation structure and particularly to a micro jet gas film generation apparatus used for cooling and heat insulation.BACKGROUND OF THE INVENTION[0002]Modern high performance gas turbines have intake temperature proximate 2,000K. In order to protect the blades, forming a cooling gas film on the metal surface of the blades through cooling airflow generated by free jet is one of the most commonly used methods to reduce the thermal stress load of the gas turbine blades.[0003]According to liquid state stability theory, a jet has an unstable state with a symmetrical eddy, which is generated by mixing natural jet with external air. As the shearing stress generated by velocity causes turbulence to grow exponentially toward downstream, after the most unstable fluctuation has grown to a certain degree, a nonlinear effect is generated and an eddy with a regular arrangement and specific frequency by rolling up is...

AI Technical Summary

Benefits of technology

[0009]By means of the structure set forth above, the micro jet gas film generated by the invention cannot produce a large eddy due to the lack of sufficient energy, hence can maintain a thin film a long distance after ejection to improve cooling and heat insulation effect. In addition, the spout is formed at a smaller diameter and consumes less gas, thus it also can reduce the amount of gas needed. As a result, the invention can provide many advantages over the conventional techniques, such as simpler design, and easier installation and implementation.

Problems solved by technology

As a result, a certain distance after ejection, the free jet is mixed with high temperature airflow, and gas film can no longer be formed continuously to protect the metal surface.

However, the embedded micro tube is complex in design and must be built inside the streamline body, it is quite difficult in fabrication.

Moreover, cooling is a problem not only happened to the turbine blades.

However, as the chip is shrunk constantly, the cooling method that adopts the radiation fins and air fan can no longer meet cooling requirement.

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